I doubt Trump ever thought of White Nationalism in an as serious manner as what Andrew Sullivan is analyzing in this long post. This is a polemical work - we got to face any pretense of intellectual foundations on which Donald Trump and Theresa May stand. Andrew Sullivan does a great job of breaking the damn and opening an intelligent dialogue with scholars who support Donald Trump.
This long article by Andrew Sullivan reminds his similar mold-breaking case for Obama in The Atlantic.
The 'die is cast'. Democrats are not going to clinch the power just on anti-Trump rage. No wonder more Americans think Democrats are more or less equally sold out to interests of Corporations.  Unless and until Democrats 'understand what is at stake' and devise politics which goes beyond Clintonism; Americans are not going to accept that party as a solution.
Any subsequent political force in America must face head on what Andrew is articulating in his post.
French presidential candidate Emmanuel Macron is one such concrete exemplification of what that 'beyond Clintonism' politics looks like.
 To overcome the perception of 'beholden to corporations'; to start with Democrats need to ban the entire PAC funding and like Bernie Sanders just depend on individual contributions. Hillary raised more money that Trump; but we all know the result. So then why compromise in the way campaign finance gets done?